Twin-circular-saw mill.



No. 799,836. PATLNTLD SEPT. 19, 1905.

H. G. DITTBLNNBR. TWIN CIRCULAR SAW MILL.

PILIOATIION FILED PEB. 12, 1904.

5 SHEETS-SHEET l.

No. 799,936. PATLNTBD SEPT. 19, 1905. H. 9. DITTBLNNLR. TWIN CIRCULAR SAW MILL.

l APPLICATIONIILBD FEB. 12. 1904.

(u 5 S HEETS-SHBBT 2. u.

44 43 I. 4L 4J PATBNTBD SEPT. 19, 1905.

H. G. DITTBBNNER.

TWIN CIRCULAR SAW MILL.

APPLICATION FILED FEB. 12,1904.

5 SHBETS-SHEET 3.

PATEN'I'ED SEPT.,19, 1905.

H. G. DITTBBNNER.

. TWIN CIRCULAR SAW MILL.

APPLICATION FILED FEB.12.1904.

5 SHEETS-SHEET 4.

R s E y n E MW ./J. f f3 a. J @.7 Wmv PATENTBD SEPT. 19, 1905.

BENNER R SAW MILL.

D PEB. 12 1904.

H. G. DITT TWIN GIRCULA APPLIOATION PILE w i... m

nNiTED sTATEs PATENT oEEIoE.

HERMANN Gr. DITTBENNER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO DIAMOND IRON INORKS, A CORPORATION OF MINNESOTA.

TWIN-CIRCULAR-SAW MILL.

Specification of Letters Patent.

Patented sept. 19, 1905.

Application filed February 12, 1904. Serial No. 193,244.

To all wiz/0m, it may concern.-

Be it known that I, HERMANN G. DITTBEN- NER, of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Twin-Circular-Saw Mills, of which the following is a specification.

My invention relates to mills designed for sawing logs without the use of a carriage; and the object of the invention is to provide a mill by means of which the slabs and also the first cut of the boards can be quickly and simultaneously removed from the log, thereby fitting it for the gang and avoiding the necessity of putting it through the resaw.

Other objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, formi ng part of this specification, Figure 1 is a plan view of a twin-circular-saw mill embodying my invention. Fig. 2 is a side elevation of the same, showing the location of the saws and the conveyer-chains with respect to the feed-chain. Fig. 3 is an elevation of the mill. Fig. 4 is a transverse vertical section showing the manner of supporting the sawsvon their arbor and the location of the feed-chain with respect thereto. Fig. 5 is a detail sectional view of the means for slidably mounting the saws. Fig. 6 is a sectional view on the line w of Fig. 5. Fig. 7 is a detail sectional View showing one of the saw-guides and the means for supporting the same. Fig. 8 is a plan View of a portion of the feed chain. Fig. 9 is transverse sectional view on the line y y of Fig. 8.

In the drawings, 2 represents a suitable frame wliereon the mill is arranged.

3 are standards supporting cross-bars 4,that are connected by fixed bridge-trees 5 and by a movable one 6, that has its ends fitting within grooves 6 in the bars 4 and normally secured therein by bolts 7. A saw-arbor 8 has bearings 9 on the said bridge-trees, and the end 1() of said arbor is of less diameter than the remaining portion thereof to allow the formation of key-seats 11, that extend from a point near the end 10 a considerable distance along the arbor. I-Iubs 12 are splined on said arbor by means of said key-seats and keys 13, and the inner ends of said hubs are provided with annular recesses to allow the saws to be slipped thereon, and shoulders formed by said recesses are provided with pins 14, adapted to enter correspondingholes in the inner saws 15 of each pair and be locked therein by means of nuts 15', fitting the threaded ends of said hubs. These hubs slide freely back and forth in the key-seats to allow the saws to be adjusted toward or from each other, according to the size of the log and the depth of the cut desired. Each hub is provided with key-seats 16 in its outer surface, wherein similar hubs 17 are locked by means of keys 18, and flanges 19 are provided at the inner ends of the hubs 17, having pins corresponding to those described, and lock-nuts 21, between which and the said lianges 19 the outer saws 22 of each pair are secured. A driven pulley 2() is mounted on the saw-arbor.

Any suitable means may be provided for guiding the saws; but I prefer to provide dovetailed plates 23, slidably arranged upon a correspondingly-shaped guide 24, provided on one of the bars 4. The guides proper, 25, are pivoted on the plates 23 and-have a series of fingers 26, that straddle the saws and carry bearing-pins 27, that are adjustable toward or from the saws and are locked by means of screws 28. A quadrant 29 is mounted on one of the bars 4 and provided with a lever 30, that is connected on opposite sides of its pivot by means of rods 31, having turnbuckles 32, by means of which the guides can be adjusted toward or from each other to vary the distance between the pairs of saws. By operating the lever 30 the .guides will be moved back and forth on their support and the saws adjusted lengthwise of their arbor to vary their position with respect to the log. The movement of the pairs of saws will be simultaneous and equal, and by means of the turnbuckles the operator can easily center them when necessary with respect to the feed-chain.

Whenever desired, the saws can be removed from their arbor by loosening the bolts 7 and slipping the movable bridge-tree out of the slots in the bars 4 and then sliding the sawhubs o the end of the arbor. At each end of the machine I provide yokes 33, pivotally supported between lugs 34 by means of setscrews 35. These yokes have bearings for a shaft 36, carrying pressure-wheels 37, having teeth 38, that bear by gravity upon the surface of the log and hold the same securely during the sawing operation. By means of IOO IIO

be adjusted by means of the screws 35 to aid in centering the pressure-wheels.

Bails 40 are provided on each yoke 33, having chains 41, by means of which the yokes and the wheels can be raised or lowered, as

desired. Below the pressure-wheels is a timber 42, provided on each side with guideplates 43, that extend above the upper edge of said timber, and between the said plates I arrange a feed-chain composed of blocks 44, connected by links 45. The blocks are provided with outwardly -inclined sockets for teeth 46, and said sockets are arranged in the opposite sides of adjoining blocks, one tooth being on one side of the chain and the next tooth on the other side, and both are outwardly inclined by the inclination of said sockets, so that the weight of the log bearing thereon will tend to press the blocks of the chain against the guides, take up lost motion caused by the wear of the link-pivots, and insure a uniform even cut when the log strikes the sa'w. This feed, as shown, is entirely below the saw-arbor out of the path of the saws, and upon each` side thereofI I provide lumber-conveyers 49, on which the slabs and boards fall and are carried away from the saws.

The operation of the machine is as follows: A log is delivered to the feed-chain in any suitable way and passing beneath the pressurewheel on the receiving side of the saw is firmly gripped thereby and forced down on the teeth of the feed-chain, which will advance the log past the saws. The weight of the log and the pressure wheel will force the links of the feed-chain out against the guide-plates and prevent any side movement of the log and variation in the out during the operation of sawing. The slabs and boards will be cut simultaneously from opposite sides of the log and will drop down upon the conveyers and be carried away, while the cant delivered from between the saws will pass on to the gang-saws. By a simpie ope-ration of the lever 30 the operator can at any time vary the distance between the saws, according to the diameter of the log to be cut, and when necessary easily center the saws with respect to the feed-chain.

I claim as my inventionl. The combination, with a saw-arbor, of circular saws splined thereon and arranged in pairs, each saw of a pair being near the other saw of the same pair and fixed with respect thereto, mechanism for moving-the pairs of saws toward or from each other on said arbor, a feed-chain operating between the pairs of saws, mechanism for holding a log upon said chain, and horizontal lumber-conveyers provided upon each side and below the level of said chain, substantially as described.

2. The combination, with a suitable frame, of a saw-arbor mounted therein, saws arranged in pairs upon said arbor and slidable lengthwise thereof, each saw of a pair being fixed with respect to the other saw of the same pair and contiguous thereto, a feed-chain operating beneath and between the pairs of saws, toothed presser-wheels pivoted on said frame above said feed-chain and adapted to bear upon the surface of the log, and horizontal lumber-conveyers provided beneath said saws and upon each side of said feed-chain, substantially as described. Y i

3. In a machine of the class described, the combination, with a frame, of a saw-arbor, circular saws arranged in pairs upon said arbor and slidable lengthwise thereof, dovetailed guides provided on said frame, correspondingly-shaped plates slidably mounted on said guides, arms 25 pivoted on said plates and having a series of fingers 26 that straddle the saws of each pair and are provided with bearing-pins, a pivoted operating-lever, and links connected with said plates and with said lever upon each side of its pivot.

4. In a machine of the class described, the combination, with a frame, of a yoke 33 pivoted thereon, adjusting-screws provided at each end of said yoke, a shaft mounted in bearings in said yoke, adjusting-screws for moving said shaft lengthwise, a presser wheel mounted on said shaft, and a feed-chain operating below said wheel.

5. In a machine of the class described, the combination, with a saw arbor and saws mounted thereon, of a feed mechanism operating between said saws and comprising guideplates, a chain operating between said plates and having a series of blocks and links connecting the same, and outwardly-inclined teeth mounted in the adjoining blocks upon alternate sides thereof, for the purpose specified.

6. The combination, with a saw-arbor and the saws mounted thereon, of a feed mechanism operating between said saws and comprising a chain having a series of blocks and links connecting the same, said blocks being provided in their alternate sides with outwardlyinclined sockets, teeth adjustably secured in said sockets, and guide-plates provided on the opposite sides of said chain and against which plates the blocks are pressed by the weight of the logs.

7 In a machine of the class described, the combination, with a frame, of a saw-arbor mounted therein, circular saws splined in pairs on said arbor each saw of a pair being near the other saw of the same pair and fixed with respect thereto, a single-lever mechanism for simultaneously moving the pairs of saws toward or from each other on said arbor, a horizontal support arranged between said saws, a feed-chain operating over said support to feed logs endwise to said saws, mechanism for holding the log to be sawed on said feed-chain, and a lumber-conveyer provided on each side of said support and chain to receive the slabs and boards from the saws, substantially as described.

IOO

8. The combination, with a saw, of a feedehain consisting of a series of blocks and links connecting the same, and outwardly-inclined teeth mounted in the adjoining blocks upon alternate sides thereof, for the purpose speciiec 9. The combination, with a saw, of a feedehain having a series of blocks and links oon- `neeting the same, said blocks being provided IO in their alternate sides With outwardly-inclined sockets, teeth secured in said sockets, and guide-plates provided upon opposite sides of said Chain, for the purpose specified.

In Witness whereof I have hereunto set my ,hand this 30th day of January, 1904.

HERMANN Gr. DITTBENNER In presence of RICHARD PAUL, M. HAGERTY. 

